#!/bin/sh
#
# Copyright (c) 2006 Johannes E. Schindelin
#

test_description='Test special whitespace in diff engine.

'
. ./test-lib.sh
. ../diff-lib.sh

# Ray Lehtiniemi's example

cat << EOF > x
do {
   nothing;
} while (0);
EOF

git update-index --add x

cat << EOF > x
do
{
   nothing;
}
while (0);
EOF

cat << EOF > expect
diff --git a/x b/x
index adf3937..6edc172 100644
--- a/x
+++ b/x
@@ -1,3 +1,5 @@
-do {
+do
+{
    nothing;
-} while (0);
+}
+while (0);
EOF

git diff > out
test_expect_success "Ray's example without options" 'test_cmp expect out'

git diff -w > out
test_expect_success "Ray's example with -w" 'test_cmp expect out'

git diff -b > out
test_expect_success "Ray's example with -b" 'test_cmp expect out'

tr 'Q' '\015' << EOF > x
whitespace at beginning
whitespace change
whitespace in the middle
whitespace at end
unchanged line
CR at endQ
EOF

git update-index x

tr '_' ' ' << EOF > x
                whitespace at beginning
whitespace          change
white space in the middle
whitespace at end__
unchanged line
CR at end
EOF

tr 'Q_' '\015 ' << EOF > expect
diff --git a/x b/x
index d99af23..8b32fb5 100644
--- a/x
+++ b/x
@@ -1,6 +1,6 @@
-whitespace at beginning
-whitespace change
-whitespace in the middle
-whitespace at end
+             whitespace at beginning
+whitespace       change
+white space in the middle
+whitespace at end__
unchanged line
-CR at endQ
+CR at end
EOF
git diff > out
test_expect_success 'another test, without options' 'test_cmp expect out'

cat << EOF > expect
diff --git a/x b/x
index d99af23..8b32fb5 100644
EOF
git diff -w > out
test_expect_success 'another test, with -w' 'test_cmp expect out'

tr 'Q' '\015' << EOF > expect
diff --git a/x b/x
index d99af23..8b32fb5 100644
--- a/x
+++ b/x
@@ -1,6 +1,6 @@
-whitespace at beginning
+             whitespace at beginning
whitespace change
-whitespace in the middle
+white space in the middle
whitespace at end
unchanged line
CR at endQ
git diff -b --ignore-space-at-eol > out
test_expect_failure 'another test, with -b --ignore-space-at-eol' 'test_cmp expect out'

tr 'Q' '\015' << EOF > expect
diff --git a/x b/x
index d99af23..8b32fb5 100644
--- a/x
+++ b/x
EOF
git diff -b > out
test_expect_success 'another test, with -b' 'test_cmp expect out'

test_expect_success 'check mixed spaces and tabs in indent' '

                # This is indented with SP HT SP.
                echo "    foo();" > x &&
                git diff --check | grep "space before tab in indent"

'

test_expect_success 'check mixed tabs and spaces in indent' '

                # This is indented with HT SP HT.
                echo "                  foo();" > x &&
                git diff --check | grep "space before tab in indent"

'

test_expect_success 'check with no whitespace errors' '

                git commit -m "snapshot" &&
                echo "foo();" > x &&
                git diff --check

'

test_expect_success 'check with trailing whitespace' '

                echo "foo(); " > x &&
                test_must_fail git diff --check

'

test_expect_success 'check with space before tab in indent' '

                # indent has space followed by hard tab
                echo "   foo();" > x &&
                test_must_fail git diff --check

'

test_expect_success '--check and --exit-code are not exclusive' '

                git checkout x &&
                git diff --check --exit-code

'

test_expect_success '--check and --quiet are not exclusive' '

                git diff --check --quiet

'

test_expect_success 'check staged with no whitespace errors' '

                echo "foo();" > x &&
                git add x &&
                git diff --cached --check

'

test_expect_success 'check staged with trailing whitespace' '

                echo "foo(); " > x &&
                git add x &&
                test_must_fail git diff --cached --check

'

test_expect_success 'check staged with space before tab in indent' '

                # indent has space followed by hard tab
                echo "   foo();" > x &&
                git add x &&
                test_must_fail git diff --cached --check

'

test_expect_success 'check with no whitespace errors (diff-index)' '

                echo "foo();" > x &&
                git add x &&
                git diff-index --check HEAD

'

test_expect_success 'check with trailing whitespace (diff-index)' '

                echo "foo(); " > x &&
                git add x &&
                test_must_fail git diff-index --check HEAD

'

test_expect_success 'check with space before tab in indent (diff-index)' '

                # indent has space followed by hard tab
                echo "   foo();" > x &&
                git add x &&
                test_must_fail git diff-index --check HEAD

'

test_expect_success 'check staged with no whitespace errors (diff-index)' '

                echo "foo();" > x &&
                git add x &&
                git diff-index --cached --check HEAD

'

test_expect_success 'check staged with trailing whitespace (diff-index)' '

                echo "foo(); " > x &&
                git add x &&
                test_must_fail git diff-index --cached --check HEAD

'

test_expect_success 'check staged with space before tab in indent (diff-index)' '

                # indent has space followed by hard tab
                echo "   foo();" > x &&
                git add x &&
                test_must_fail git diff-index --cached --check HEAD

'

test_expect_success 'check with no whitespace errors (diff-tree)' '

                echo "foo();" > x &&
                git commit -m "new commit" x &&
                git diff-tree --check HEAD^ HEAD

'

test_expect_success 'check with trailing whitespace (diff-tree)' '

                echo "foo(); " > x &&
                git commit -m "another commit" x &&
                test_must_fail git diff-tree --check HEAD^ HEAD

'

test_expect_success 'check with space before tab in indent (diff-tree)' '

                # indent has space followed by hard tab
                echo "   foo();" > x &&
                git commit -m "yet another" x &&
                test_must_fail git diff-tree --check HEAD^ HEAD

'

test_expect_success 'check trailing whitespace (trailing-space: off)' '

                git config core.whitespace "-trailing-space" &&
                echo "foo ();   " > x &&
                git diff --check

'

test_expect_success 'check trailing whitespace (trailing-space: on)' '

                git config core.whitespace "trailing-space" &&
                echo "foo ();   " > x &&
                test_must_fail git diff --check

'

test_expect_success 'check space before tab in indent (space-before-tab: off)' '

                # indent contains space followed by HT
                git config core.whitespace "-space-before-tab" &&
                echo "   foo ();" > x &&
                git diff --check

'

test_expect_success 'check space before tab in indent (space-before-tab: on)' '

                # indent contains space followed by HT
                git config core.whitespace "space-before-tab" &&
                echo "   foo ();   " > x &&
                test_must_fail git diff --check

'

test_expect_success 'check spaces as indentation (indent-with-non-tab: off)' '

                git config core.whitespace "-indent-with-non-tab"
                echo "        foo ();" > x &&
                git diff --check

'

test_expect_success 'check spaces as indentation (indent-with-non-tab: on)' '

                git config core.whitespace "indent-with-non-tab" &&
                echo "        foo ();" > x &&
                test_must_fail git diff --check

'

test_expect_success 'check tabs and spaces as indentation (indent-with-non-tab: on)' '

                git config core.whitespace "indent-with-non-tab" &&
                echo "                   foo ();" > x &&
                test_must_fail git diff --check

'

test_expect_success 'line numbers in --check output are correct' '

                echo "" > x &&
                echo "foo(); " >> x &&
                git diff --check | grep "x:2:"

'

test_expect_success 'checkdiff detects trailing blank lines' '
                echo "foo();" >x &&
                echo "" >>x &&
                git diff --check | grep "ends with blank"
'

test_expect_success 'checkdiff allows new blank lines' '
                git checkout x &&
                mv x y &&
                (
                                echo "/* This is new */" &&
                                echo "" &&
                                cat y
                ) >x &&
                git diff --check
'

test_expect_success 'combined diff with autocrlf conversion' '

                git reset --hard &&
                echo >x hello &&
                git commit -m "one side" x &&
                git checkout HEAD^ &&
                echo >x goodbye &&
                git commit -m "the other side" x &&
                git config core.autocrlf true &&
                test_must_fail git merge main &&

                git diff | sed -e "1,/^@@@/d" >actual &&
                ! grep "^-" actual

'

test_done


